👉 Veins are blood vessels that carry deoxygenated blood back to the heart. They have thinner walls and larger diameters than arteries, which allows them to accommodate the lower pressure of blood returning from the body's tissues. Veins contain one-way valves that prevent the backward flow of blood and ensure it moves towards the heart. The walls of veins also contain smooth muscle that helps propel blood through the circulatory system.
